| Autor: |
Valeri V. Gladun, Yuri A. Pirogov, Andrey I. Dubina, Magdy F. Attia, Dmitri A. Tischenko, Evgeni N. Terentiev |
| Rok vydání: |
1997 |
| Předmět: |
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| Zdroj: |
Passive Millimeter-Wave Imaging Technology. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.277087 |
| Popis: |
A method of passive millimeter-wave imaging with super-resolution using a phased array antenna system has been developed. Theenhancement of the image resolution has been achieved by using severalmathematical methods including the new method of reduction inventedby the Russian mathematician Pytiev. I. INTRODUCTION Spatial resolution for passive millimeter wave imaging systems isseverely restricted due to the diffraction limit of the antenna system. The beamwidth 9 of an antenna system with a square aperture can be approximated by: 9/D, (1) where 6 is in radians, 2 is the wavelength and D is a linear dimension of the antenna aperture. The Ground Resolved Distance (GRD ), for an altitude h and a slant angle a is given by [3]: GRD=2h9/cosa (2) The GRD represents the minimum dimension of a possibly resolvedobject, the Rayliegh level. In order to increase the resolution the antenna aperture should be increased to decrease the beamwidth 9 . There are practical limitations of increasing the antenna aperture. Also, theexistence of the antenna pattern side lobes should be taken into |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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